Excavator.



PATENTED DEG, 31

0. A. PRAYER.

EXOAVATOE. APPLICATION FILED SEPTJLIQOS.

SEEBTS-SHEET 1.

I N VEN TOR TTORNEi".

,EIUTNESSES: 6 /22 (45% Q/Q LK m $13,420, PATENTEID DEG. a1, 1907.

G. A. PRAYER. EXGAVATGE.

APPLICATION FILED SEPT. 11. 1905.

2 SHEETS-SHEET Z.

:rvwzssss: INVENTOR -'UNITED STATES PATENT oFFIoE.

CHARLES A. FRAYER, OF MILWAUKEE, \YISUUNSIN, ASSIGNOR TO ALLIS-CHALMERSCOMPANY, OF MILWAUKEE, WISCONSIN, A. CORPORATION OF NEW JERSEY.

EXCAVATOR.

Specification of Letters Patent.

Patented Dec. 31, 1907.

Application filed September 11. 1905] Serial No. 277.876.

To all whom it may concern:

Be it known that 1, CHARLES A. FRAYER, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State of\Nisconsin, have invented certain new and useful Improvements inExcavators, of which the following is a specification.

This invention relates to an Excavator,

and in using the term excavator, any.

mechanism is meant which is capable of ex: cavating or digging earth,sand, gravel, etc. The term excavator is therefore intended to includeeither a dredge or a power shovel.

The object of the invention is to so arrange the operating cables thatthey will relieve the dipper or operating part of the dredge or shovelof all twistingstrains due to material being caught at either side ofthe cutting edge of the dipper bucket.

In disclosing the invention the same has been applied to a-hydraulicdipper dredge, that is, a suction dredge in which the material is drawnup through the dipper by means ci. a stream of water drawn u by acentrifugal pump mounted upon the arge.

In the drawings: Figure 1 shows a vertical svct ion of the forward partof the barge upon which is located a hydraulic di )pcrdredge to which myinvention is applied. Fig. 2 is a transverse vertical section of thesame. Fig. 3 is a plan view.

Referring to the drawings, Fig. 1 shows the dredge in the act ofdigging. The suction pipe of a pump ends in a form of dipper 2,

comprising a bucket 3 and a handle 4. The handle may be extensible asshown. The

bucket is formed with a cutting edge 5 at the bottom and a guard orrunner 6 at the top. This allows the dipper to slice oil the material adipper dredge would, but it can only cuter the earth as the guard orrunner is strikes the surface, it is prevented from burying itscllbeyond the point desired. Across the mouth ol" the dipper, cutter bars 7are vertically placed so as to cut the nniterial into slices andpartially prepare it for the action 01' the water. These cutters arcnecessary when clay is handled, but can be dispensed within sand orgravel work.

The dipper handle 4 is hollow and leads to a stone box 8, provided withgrizzly bars J which are placed on a slant and divide the stone box intoupper and power cmnpartments. The purpose of the grizzly bars is toseparate large stones and boulders from the incoming stream of material,these accumulating in the upper compartment of the stone box and beingperiodically removed through a manhole provided for that pur use Thelower compartment of the stone box has an outlet extending to thesuction of the centrifugal pump. u a

The dip )er 2 is mounted upon trunnions 10, 11, see Fig. 2, so as to beswung in a vertical plane. The operating means for swingin the dipper inits working stroke consist oi cables 12, 13, attached to the lower endof the dipper near or directly to the bucket 3. The points of attachmentare spaceda'part transversely of the operating plane. The cables 12, 13,extend from the lower end of dipper handle 3 to and around sheaves 14,15, Figs. 1 and 3, upon a swinging frame 16 which is mounted upon theforward end of the barge deck in supports 17, 18. From the sheaves 14,15, cables 12, 13, extend upwardly.over sheaves 19, 20, Figs. 1 and 2,mounted at the top of the A-frame 21, Figs. 1 and 2. From the sheavesll), 20, the cables 12, 13, extend dmvnwardly to the winding drum 22.Turnbuckles 23, 24, Fig. 2, are conveniently placed. somewhere in thelength ol cables 12, 13, so as to provide for equal tensioning of thesecables.

in operation the dipper 2 is swung up on trunnions 11), l l, by thewinding up of cables 12, 13, upon the drum 22 by engine mechanism notdescribed. Should the bucket 3 strike an obstructionin the bank beingexcavated, and such obstruction be caught by the side cutting edge 01the bucket, there will be a tendency to twist the dipper handle 4. Thistendency is avoided by the connection of cables 12, 13 to the ilippcr atpoints spaced apart, as plainly indicated in Fig. 2. All the straincaused by the obstruction as above, will, in the present invention, comedirectly upon one of the two cables 12, 13, and prevent any twisting ofthe dipper handle 4.

In the present disclosure of the invention, the dipper is shown astelescopic, but this has no direct relation. to -the present inventlull.

In accordance with the )rovisions of the 1 patent statutes, theprinciple of o eration of has been describe together 1 the inventionother means.

- operatin spaced a art transversely of the operating P bucket having anentering e e and a ham. le,

- a plurality o with the apparatus which is now considered torepresentthe best embodiment thereof; but it is desired to be understood that thea paratus shown is merely illustrative and. tli at the inventioncan becarried out by What is claimed is Y 1. In an excavator, a dippercomprising a bucket having a cutting edge and a handle, and simultaneouso crating means for the dipper including. a urality of ropes spacedapart having space attachment to the dipper near its cutting edge;

2. In an excavator, a di per comprisin a bucket having a cutting edgeand a handle, means for the dipper for the working stroke including aplurality of ropes spaced a art transversely of the operating p ane amhavingattachment to the dipper ane an near the cutting edge of thedipper. 3. In an excavator, a dip er comprisin a means for the ipperincluding ropes spaced a art and having spaced attachment to the dippernear the entering edge of the bucket.

4. In an excavator, a dipper comprising a i and elevating and elevatinmeans for t e dipper including a plurality 0 ropes spaced apart andhaving .svaaeo horizontally spaced attachment to the di per and directedtowards the entering edge 0 the dipper.

, 5. In an excavator, a dip er comprising a bucket having an entering ee and a handle 7 and means for elevating the i 'per' in a vertical laneincluding a plura ity of ropes s a art transversely of the elevating pane an having attachment to the di per transversely spaced as to theelevating p ane and directed towards the entering edge of the dipper.

6. In an excavator, a dip er havin a cutting or entering edge and ahandle, and flexible means for operatin the dipper having attachment tothe ipper at points spaced apart but near the cutting or entering edgeof t 1e dipper.

7. In an excavator, a dip er havin a cutting or entering edge an a hande, and flexible means for operating the dipper having attachment to thedipper at points spaced apart, the said flexible means extending towardsthe cutting or entering edge of the dip- In testimony whereof I aflix mysignature k in presence of two witnesses.

CHARLES A. FRAYER. Witnesses JOHN DAY, Jr., R. M. STONE.

